Non-metallic flexible conduit



H. HANSEN.

NUN-METALLIC FLEXlBLE CONDUIT. APPLlcAfmn FILED JULY l, 1919.

1 ,37 6,618. Patented May 3, 1921'.

UNITED STATES PATENT OFFICE.

HANS HANSEN, 0F IASPETH, NEW YORK, ASSIGNOR T0 EASTERN TUBE AND TOL C0., INC., A. CORPORATION OF NEW YORK.

NoN-METALLIC FLEXIBLE coNnUIr.

Specification of Letters Patent.

Patented May s, 1921.

Application filed July 1, 1919. Serial No. 308,035.

T o all whom itma-y concern:

Be it known that LHKS HANSEN, a citizen of the Y United States, residing at 26 Monte Verde avenue, Maspeth, Long Island, New York, have invented certain new and useful Improvements in Non-Metallic Flexible Conduits, of which the following is a clear, full, and exact description.

This invention relates to flexible tubular woven conduits or circular looms such as are commonly employed for carrying electric wires. and a general object of the invention is to improve the construction and to facili- Y tate the manufacture of such looms and particularly to provide a flexible tubular conduit construction which will meet all of the requirements of the fire insurance underwriters, with respect both to crushing tests and to stretching tests.

Other objects and important features of the invention will appear from the following description and claims when considered in connection with the accompanying drawings, in which- Figure 1 is a view in side elevation, partly sectioned, of a flexible tubular conduit embodying the present invention;

Fig. 2 illustrates in section one form of improved weft strand in one stage of its manufacture Fig. 3 is a section of completed weft strand of the type shown in Fig. 2;

Fig. 4 is a section showing the relative arrangement of the parts of another type of weft strand, and

Fig. 5 is a section through a completed weft strand of the type shown in Fig. 4'.

Referring to the drawings, the circular loom shown in Fig. 1 comprises a weft or Woof strand 2, helically coiled and interwoven with warp strands 4 of twisted paper and other warp strands 6 of textile fiber. the warp strands 4 and 6 preferably alternating.

To provide for the necessary stiffness in the weft or woof strands 2, these strands are preferably formed of a cord 8 of textile liber incased within. a covering l0 of paper, which may be formed in the manner shown in Fig. 2 by simply wrapping or coiling about the cord 8 a strip of paper and preferably cementing it in its coiled condition and then preferably flattening the strand thus formed as shown in Fig. 3, or the weft or Woof strand may he formed as illustrated in Figs. 4 and 5, in which the incasing covering l2 is shown as infolded upon itself and receiving the cord 14 between the folds or between the infolded part and the original strip, the completed strip being preferably molded into the flattened condition shown in Fig. 5, and being preferably cemented in this condition. f

From the foregoing description it will be seen that there has been provided a flexible tubular conduit having not only the desired transverse strength to resist crushing strain and the desired resistance to longitudinal stretching by reason of the interwoven warp strands 4 of twisted paper, but also having greater strength than flexible tubular woven conduits heretofore made, by reason of the use of the reinforced weft strands 2. It will also be observed that the reinforced strands 2 are not necessarily restricted to use as weft strands, and that they can also be used as warp strands, thus still further increasing the strength 'and durability of the construction, and at the same time facilitating its manufacture by reason of the greater strength of these strands and accordingly the greater speed and positiveness with which they can be handled.

`What I claim is:

1. In a flexible tubular conduit, a helically coiled weft strand, comprising a cord surrounded by paper` and alternate warp strands of textile fiber and 'of paper interwoven therewith.

2. In a flexible tubular conduit, a helically coiled flattened weft strand, comprising a cord inclosed within a paper strip infolded upon itself, and alternating warp strands of textile fiber and of paper interwoven with said weft strand.

Signed at New-York, New York, this 19th 

